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Profiling
To make it easier to track down performance problems GitLab comes with a set of profiling tools, some of these are available by default while others need to be explicitly enabled.
Sherlock
Sherlock is a custom profiling tool built into GitLab. Sherlock is only
available when running GitLab in development mode and when setting the
environment variable ENABLE_SHERLOCK to a non empty value. For example:
ENABLE_SHERLOCK=1 bundle exec rails s
Recorded transactions can be found by navigating to /sherlock/transactions.
Bullet
Bullet is a Gem that can be used to track down N+1 query problems. Because
Bullet adds quite a bit of logging noise it's disabled by default. To enable
Bullet, set the environment variable ENABLE_BULLET to a non-empty value before
starting GitLab. For example:
ENABLE_BULLET=true bundle exec rails s
Bullet will log query problems to both the Rails log as well as the Chrome console.
As a follow up to finding N+1 queries with Bullet, consider writing a QueryRecoder test to prevent a regression.
GitLab Profiler
Gitlab-Profiler was built to help developers understand why specific URLs of their application may be slow and to provide hard data that can help reduce load times.
For GitLab.com, you can find the latest results here: http://redash.gitlab.com/dashboard/gitlab-profiler-statistics